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Net Income Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net (loss) income available to IFF shareholders $ (1,018) $ 60
Weighted average common shares outstanding (basic) (in shares) 256,000,000 255,000,000
Weighted average shares assuming dilution (diluted) (in shares) 256,000,000 256,000,000
Net income per share - basic (in dollars per share) $ (3.98) $ 0.23
Net income per share - diluted (in dollars per share) $ (3.98) $ 0.23
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   1,100,000
Stock options and restricted stock awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Adjustment for assumed dilution (in shares) 0 1,000,000